CN1581270A - Method for executing high-speed error diffusion and driving device for plasma displaying panel - Google Patents

Method for executing high-speed error diffusion and driving device for plasma displaying panel Download PDF

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CN1581270A
CN1581270A CNA2004100794924A CN200410079492A CN1581270A CN 1581270 A CN1581270 A CN 1581270A CN A2004100794924 A CNA2004100794924 A CN A2004100794924A CN 200410079492 A CN200410079492 A CN 200410079492A CN 1581270 A CN1581270 A CN 1581270A
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error
pixel
error diffusion
number subframe
odd
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CN100395801C (en
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朴胜虎
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Samsung SDI Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2059—Display of intermediate tones using error diffusion
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0224—Details of interlacing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

A method for diffusing errors in a display device. Each frame of an input video signal is separated into at least two independent subframes. An error diffusion process is applied to each subframe of at least two independent subframes. The errors transmitted reciprocally from subframes are partially mixed, and the error diffusion process is applied to the mixed errors at each independent subframe.

Description

Carry out the method and the driving apparatus for plasma display panel thereof of high speed error diffusion
The cross reference of related application
That the application requires is that on August 12nd, 2003 submitted to Korea S Department of Intellectual Property, application number is the right of priority and the interests of the korean patent application of No.2003-55838, and its full content is incorporated herein with for referencial use.
Technical field
The present invention relates to a kind of in display device the method for propagated error, especially relate to a kind of method of carrying out the high speed error diffusion, and the driving apparatus for plasma display panel that uses this method.
Background technology
Usually, in various display devices, for example plasma display panel (PDP), LCD (LCD) and display of organic electroluminescence (OLED), but when the display gray scale data volume when being used for the gray-scale displayed data volume, the use error method of diffusion compensates usually.Especially, error diffusion method generally is used for contrary Gamma correction or is used for the reduction of mistake profile.Error diffusion method sends error to surrounding pixel, but these errors result from the display gray scale data and expectation is used for the gray-scale displayed data, and represents that fifty-fifty expectation is used for the gray-scale displayed data in a certain zone.
Be called in name among the open text No.2002-18900 of Korean Patent of " A gamma display correction apparatus for plasma display panel; and method using the same (the gamma display correction device and the using method thereof of plasma display panel) ", described the example of conventional error diffusion method.
Fig. 1 represents to be used for the conventional error diffusion method of contrary Gamma correction, and it is used to drive plasma display panel.In conventional plasma scope, input analog video signal 10.By A/D (analog/digital) conversion 20 analog signal conversion is become the N position digital signal, and output.Be output as the signal that each pixel is exported by the A/D conversion, the picture element signal frequency of output becomes 60 * n * m (Hz) by NTSC (NTSC) method of 60Hz.And the size of output frame becomes: wide * length=n * m.
Signal by A/D conversion output obtains contrary Gamma correction 40, is used to compensate in cathode ray tube (CRT) for showing the Gamma correction of carrying out.Then, when the conversion of signals of contrary Gamma correction becomes can be on PDP during the gray-scale displayed data, the gradation data with conventional error diffusion 50 is applied to change is used for losing of compensating for gray-scale data, signal is exported to PDP60 be used to show corresponding image.
And along with the progress of video display apparatus, the frame amount that is used to show increases so that show high-quality image.Similarly, along with further developing of display device, the amount of pixels of moving in the finite time frame has increased.On the pixel of each input, carry out error diffusion by conventional error diffusion method, therefore be difficult to carry out the Real-time Error DIFFUSION TREATMENT.
Therefore, because in the high-resolution display device, the amount of pixels of operation has increased in the finite time frame, need a kind of method of carrying out the high speed error diffusion.
Summary of the invention
According to the present invention, provide a kind of and handled the method for carrying out the high speed error diffusion by at least two contiguous pixels are carried out error diffusion.A kind of driving apparatus for plasma display panel that uses this method also is provided.
For addressing the above problem, one aspect of the present invention is the method for propagated error in display device.Each frame of incoming video signal is divided at least two independent subframes.Error diffusion handled being applied on each subframe of at least two independent subframes, wherein the error that transmits mutually from subframe is carried out partially mixedly, and error diffusion handled on the combined error that is applied in each independent subframe.
In one embodiment, at least two independent subframes are odd number subframe group and even number subframe group, and odd number subframe group is the pixel groups that is positioned at the odd-numbered line of a frame, and even number subframe group is the pixel groups that is positioned at the even number line of a frame.
In addition, in another embodiment, be used for error that the error diffusion in the odd number subframe group handles with near the error addition that pixel transmitted in the even number subframe group of object pixel, and error diffusion handled be applied to this combined error.
In another embodiment, the pixel that is used for transmitting error in the even number subframe group is positioned at the higher row of pixel than odd number subframe group, and the transmission error that mix is increased in the pixel in this odd number subframe group.
In another embodiment, handle, added near the error that pixel transmitted in the odd number subframe group of object pixel, and error diffusion handled be applied to this combined error for the error diffusion in the even number subframe group.
In addition, in another embodiment, the pixel that is used for transmitting error in the odd number subframe group is positioned at the higher row of pixel than even number subframe group, and the transmission error that mix is increased in the pixel in this even number subframe group.
In addition, in another embodiment, transmit the location of pixels of error and determine according to the type of the error diffusion coefficient that is used for definite error.
Another aspect of the present invention is a driving apparatus for plasma display panel.Analog/digital converter converts the analog video signal of input digital video signal to and exports digital signal.Analog/digital converter is divided into each frame of vision signal at least two independent subframes and exports sub-frame data.Contrary gamma corrector is carried out contrary Gamma correction according to the characteristic of plasma display panel at least two independent subframes exporting from analog/digital converter.The error diffusion unit is applied to data by error diffusion is handled, will become from the data-switching of contrary gamma corrector output can be on PDP the gray-scale displayed data, and export this gradation data.Each subframe that is applied at least two independent subframes is handled with error diffusion in the error diffusion unit, and part is mixed the error that transmits mutually from subframe therein.
The error diffusion unit comprises odd number subframe error diffusion unit and even number subframe error diffusion unit.Odd number subframe error diffusion unit is to the odd pixel group at least two independent subframes, and promptly odd number subframe group is carried out error diffusion and handled.Odd number subframe error diffusion unit mixes from the error that a plurality of pixel transmitted near object pixel, and described a plurality of pixels are positioned at even number subframe group, promptly in the even pixel group at least two independent subframes, and error diffusion handled is applied to combined error.Even number subframe error diffusion unit is carried out error diffusion to the even number subframe group at least two independent subframes and is handled.Even number subframe error diffusion unit mixes from the error that a plurality of pixel transmitted near object pixel, and described a plurality of pixels are arranged in the odd number subframe group of at least two independent subframes, and the error diffusion processing is applied to combined error.
In addition, odd number subframe error diffusion unit comprises: first adder, and be used for and will be increased to from the gradation data of the odd number subframe group of exporting against gamma corrector from the error that a plurality of pixel transmitted near object pixel, and the output gray level data; The first gradation data converter, be used for converting to from the gradation data of totalizer output can be on PDP the gray-scale displayed data, and this gradation data exported to PDP; Second adder is used to calculate from the gradation data of first adder output and from the error between the gradation data of first gradation data converter output, and exports this error; First delay cell is used for the pixel of error delay from second adder output, and exports this error; First line storage is used for the error delay delegation from second adder output, and this error is exported to even number subframe error diffusion unit; With the first error diffusion coefficient elements, be used for using predetermined error diffusion coefficient, and the sum of errors that obtains is exported to first adder from the error of even number subframe error diffusion unit output to the error that postpones by first delay cell and first line storage and export.
In addition, even number subframe error diffusion unit comprises: the 3rd totalizer is used for and will be increased to from the gradation data of the even number subframe group of contrary gamma corrector output from the error that a plurality of pixel transmitted near object pixel, and exports this gradation data; The second gradation data converter, be used for converting to from the gradation data of the 3rd totalizer output can be on PDP the gray-scale displayed data, and export to PDP; The 4th totalizer is used to calculate from the gradation data of the 3rd totalizer output and from the error between the gradation data of second gradation data converter output, and exports this error; With second delay cell, be used for pixel of error delay, and export this error from the output of the 4th totalizer; Second line storage is used for the error delay delegation from the output of the 4th totalizer, and this error is exported to odd number subframe error diffusion unit; With the second error diffusion coefficient elements, be used for to the predetermined error diffusion coefficient of error application, and the sum of errors that obtains is exported to the 3rd totalizer from the error of odd number subframe error diffusion unit output by second delay cell and fourth line memory latency and output.
Another aspect of the present invention is the method for propagated error in display device.Receive simultaneously with the incoming frame demonstration in the corresponding data of at least two pixels that are adjacent to each other.Error diffusion is handled these at least two pixels that are applied to import simultaneously, wherein will mix from each error that at least two pixels transmitted, and the error diffusion processing is applied to this combined error, so that the error diffusion processing is applied to this at least two pixels.
In an embodiment, be adjacent to each other and at least two pixels of input simultaneously are odd pixel and near the even pixel of this odd pixel.In this case, be that the error diffusion processing is applied under the situation of these two pixels simultaneously at least, be applied to odd pixel for error diffusion is handled, will mix by the error that last even pixel transmitted by the sum of errors that last odd pixel transmitted near this odd pixel.The error diffusion processing is applied to this combined error.Be applied to even pixel for error diffusion is handled, will mix by the error that last odd pixel transmitted by the sum of errors that last even pixel transmitted, and the error diffusion processing is applied to this combined error near this even pixel.
In addition, in an embodiment, the odd pixel that transmits combined error is arranged in than combined error and is applied to wherein the higher row of even pixel.
In addition, in another embodiment, the even pixel that transmits combined error is arranged in than combined error and is applied to wherein the higher row of odd pixel.
Description of drawings
Fig. 1 represents to be used for the conventional error diffusion method of contrary Gamma correction, and this contrary Gamma correction is used to drive plasma display panel.
Fig. 2 represents the block scheme according to the driving apparatus for plasma display panel of embodiment, and it uses the method for carrying out the high speed error diffusion.
Fig. 3 (a) expression is input to the frame data structure figure of A/D converter, and it is used for two frame data shown in Fig. 2.
Fig. 3 (b) and 3 (c) expression are from two frame data structures of A/D converter output, and it is used for two frame data shown in Fig. 2.
Fig. 4 represents Floyd-Steinberg (coefficient of Floyd-Si Taiyinbeige), a kind of common error diffusion coefficient.
Fig. 5 (a) expression uses the Floyd-Steinberg coefficient to transmit the figure of the processing of each subframe error, and it is used for the even pixel frame.
Fig. 5 (b) expression uses the Floyd-Steinberg coefficient to transmit the figure of the processing of each subframe error, and it is used for the odd pixel frame.
Fig. 5 (c) expression uses the Floyd-Steinberg coefficient to transmit the figure of the processing of each subframe error, and it is used to transmit total processing of error.
The block scheme of the error diffusion unit shown in Fig. 6 (a) presentation graphs 2, it is used for carrying out error diffusion at the even pixel frame and handles.
The block scheme of error diffusion unit shown in Fig. 6 (b) presentation graphs 2, it is used for carrying out error diffusion at the odd pixel frame and handles.
Fig. 7 represents to be used for the figure of 8 bit test images.
Fig. 8 represents to transmit the image that processing is produced by the independent error shown in Fig. 5.
The mixed type error that Fig. 9 represents to have used according to the Floyd-Steinberg coefficient of embodiment transmits the figure that handles.
Figure 10 represents to transmit the image that processing is produced by the error of mixed type shown in Fig. 9.
Figure 11 represents the error diffusion unit block scheme according to embodiment, and it has used the mixed type error to transmit and has handled.
Figure 12 represents the FAN coefficient, a kind of common error diffusion coefficient.
Figure 13 (a) expression is used the independent error of FAN coefficient to transmit and is handled figure, and it is used for the even pixel frame.
Figure 13 (b) expression is used the independent error of FAN coefficient to transmit and is handled figure, and it is used for the odd pixel frame.
Figure 13 (c) expression is used the independent error of FAN coefficient to transmit and is handled figure, and it is used to transmit total processing of error.
Figure 14 represents to use the mixed type error according to the FAN coefficient of embodiment to transmit the figure that handles.
Embodiment
With reference to figure 2, diagram is according to the block scheme of the driving apparatus for plasma display panel of the embodiment of the invention, and it has used the method for carrying out the high speed error diffusion.Driving apparatus for plasma display panel comprises A/D converter 100, contrary gamma corrector 200,300 and error diffusion unit 400,500.
A/D converter 100 converts the analog video signal of input to digital video signal, and exports this digital video signal.When analog video signal converts digital video signal to, two contiguous pixels signals of the independent simultaneously output of A/D converter.Therefore, change in A/D converter 100 and export under the situation of a frame video signal, form independent frame data (frame 1, frame 2), their size is half of a frame.In this case, the size of each frame 1 and frame 2 becomes: width * length=n/2 * m.
Equally, two contiguous pixels signals of the independent simultaneously output of A/D converter 100, because the frequency of picture element signal is 60Hz (a NTSC method just), the size of frame becomes 60 * (1/2) * n * m.Thus, frame size is reduced to 1/2 of frame size when using conventional frequency, can easily carry out real-time calculating.
Two contrary gamma corrector 200,300 are respectively two independent frame data 1 and the contrary Gamma correction of frame data 2 execution, and frame data 1 are corresponding with two contiguous pixels signals exporting from A/D converter 100 respectively with frame data 2.
In addition, two error diffusion unit 400,500 proofread and correct from output data to the data of can be on PDP600 losing the conversion of gray-scale displayed data, and gradation data exported to PDP.Output data obtains contrary Gamma correction in two contrary gamma corrector 200,300.
PDP600 receives the data of 400,500 outputs from two error diffusion unit respectively, and mixes these data, exports corresponding video image.In this case, assembled unit and driver element etc. are known to those skilled in the art, assembled unit is used to make up the data of 400,500 outputs from two error diffusion unit respectively, and driver element is used for producing the data relevant with subdomain and driving PDP600 etc. from the data of mixing.Therefore, explanation to these unit is no longer described here.
The structural drawing of two frame data shown in Fig. 3 (a)-3 (c) presentation graphs 2, wherein Fig. 3 (a) is the frame data structure that is input to A/D converter, Fig. 3 (b) and Fig. 3 (c) expression are from two frame data structures of A/D converter output.
As shown in Fig. 3 (a)-3 (c), in being input to whole frame data of A/D converter 100, two contiguous pixels are expressed as E pixel (even pixel) and O pixel (odd pixel).Two contiguous pixels signals are exported simultaneously from A/D converter 100, form two framing data.These two framings data are divided into even pixel frame (frame 1) independently and are arranged in a group of E pixel and odd pixel frame (frame 2) of even number line and are arranged in one group of O pixel of odd-numbered line.
In error diffusion unit 400,500, the propagated error method is applied in each of independent these two frame data that form.In this case, the error diffusion coefficient influences picture quality.The method of propagated error sends the error between gradation data to surrounding pixel.When error sends surrounding pixel to, on the precalculated position, use the predefined weight dispensing error, and transmit the error of disperseing.Weight is called the error diffusion coefficient, in known error diffusion coefficient the Floyd-Steinberg coefficient is arranged.Illustrate the Floyd-Steinberg coefficient among Fig. 4.
A plurality of subframes (even pixel frame and odd pixel frame) have been divided into reference to 4, one frames of figure, respectively the application error DIFFUSION TREATMENT.For example, represented in each subframe, to use the processing of Floyd-Steinberg coefficient propagated error among Fig. 5 (a) and Fig. 5 (b).Two processing of propagated error mix in two frames, and to become a processing of propagated error in a frame, it is shown among Fig. 5 (c).
Being sent to shown in sum of errors Fig. 5 (b) of a pixel error that is sent to a pixel from a frame from a frame shown in Fig. 5 (a) can calculate according to following formula 1 and formula 2 respectively.
[formula 1]
E sum e ( 2,2 ) = w - 1 , - 1 × E even ( 1,1 ) + w 0 , - 1 × E even ( 2,1 ) + w 1 , - 1 × E odd ( 3,1 ) + w - 1,0 × E even ( 1,2 )
[formula 2]
E sum o ( 2,2 ) = w - 1 , - 1 × E odd ( 1,1 ) + w 0 , - 1 × E even ( 2,1 ) + w 1 , - 1 × E odd ( 3,1 ) + w - 1,0 × E even ( 1,2 )
Here, E Sum e(x, y) expression is carried out and is sent (x, the y) sum of errors of pixel, E in the even pixel frame when error diffusion is handled to Sum o(x, y) expression is carried out and is sent (x, y) sum of errors of pixel in the odd pixel frame when error diffusion is handled to.
The block scheme of error diffusion unit 400,500 shown in Fig. 6 (a) and Fig. 6 (b) presentation graphs 2.Fig. 6 (a) is described in and carries out the error diffusion unit 400 that error diffusion is handled in the even pixel frame, and Fig. 6 (b) is described in and carries out the error diffusion unit 500 that error diffusion is handled in the odd pixel frame.
As shown in Fig. 6 (a), error diffusion unit 400 comprises totalizer 410,430, gradation data converter 420, line storage 450 and error diffusion coefficient elements 460.
Totalizer 410 will be added to from the error of error diffusion coefficient elements 460 outputs from the gray scale of the even pixel frame of A/D converter 100 and contrary gamma corrector 200 outputs, and this gradation data is exported to gradation data converter 420 and totalizer 430.
Gradation data converter 420 will convert to from the gradation data of totalizer 410 output can be on PDP600 shown in Figure 2 the gray-scale displayed data, and this gradation data exported to PDP600 and totalizer 430.
Totalizer 430 is used to calculate from the gradation data of totalizer 410 outputs and from the error between the gradation data of gradation data converter 420 outputs, and this error is exported to delay cell 440 and line storage 1450.
Delay cell 440 will be from pixel of error delay of totalizer 430 output, and this error is exported to the error diffusion coefficient elements.
First line storage 450 postpones during delegation from the error of totalizer 430 outputs, and this error is exported to error diffusion coefficient elements 460.
The error diffusion coefficient elements with the predictive error coefficient of diffusion be applied to from delay cell 440 and first line storage 450 postpones and the error of output on, Floyd-Steinberg coefficient for example, and the error of obtaining exported to first adder 410.
The operation of error diffusion unit 400 is as follows.At first, by the gradation data of A/D converter 100 from contrary gamma corrector 200 output even pixel frames.Be input at gradation data under the situation of totalizer 410, send current pixel to and the error handled by error diffusion coefficient elements 460 is added in the totalizer 410.Then, synthetic gradation data, i.e. gradation data and error sum, convert to can be on PDP600 the gray-scale displayed data, and output to PDP600.
Poor between the gradation data that totalizer 430 is calculated 420 conversions of gradation data converters and the conversion gradation data before, and the difference of gained exported as error.Delay cell D440 is used to transmit the error of next even pixel with pixel of error delay.First line storage 450 is used to transmit the error of next line with error delay delegation.The error diffusion coefficient elements is applied to the error diffusion coefficient in the error of obtaining, and error diffusion coefficient elements response pixel transmits, and error is exported to totalizer 410.
Error diffusion unit 500 shown in Fig. 6 (b) comprises totalizer 510,530, gradation data converter 520, delay cell D540, second line storage 550 and error diffusion coefficient elements 560.Except the input gradation data be the gradation data of odd pixel frame, the structure of error diffusion unit 500 is identical with error diffusion unit 400 with operational motion.Though be not elaborated at this, those of ordinary skills can easily understand that the structure and the operation of error diffusion unit 500.
Return with reference to figure 5 (c), from entire frame shows, be applied to each independently frame, increased so error is sent to the distance of a pixel because error diffusion is handled.When 8 digital videos shown in Fig. 7 were imported, Fig. 8 represented to be used for constructing two independent frames as shown in Figure 3 and uses independently that error transmits the image result that processing obtains.Transmit processing at each independent error and be applied under the situation of two contiguous pixels, the distance that error is sent to a pixel increases, and has caused low spatial frequency.Therefore, many radio-frequency components are lost, and video produces broken as shown in Figure 8.
For solving such problem, embodiments of the invention application mix type error transfer approach, wherein the gradation data between even pixel frame and the odd pixel frame is partially mixed.Just, as shown in Fig. 5 (c), only the error of carrying out between even pixel in the even pixel frame transmits, and only the error of carrying out between odd pixel in the odd pixel frame transmits.Yet the error in the even pixel frame transmits and not only carries out between even pixel, mixes with the error that transmits from even pixel from the fractional error that near odd pixel transmits.In an identical manner, the error in the odd pixel frame transmits and not only carries out between odd pixel, mixes with the error that transmits from odd pixel from the fractional error that near even pixel transmits.At this moment, transmit the pixel of wanting combined error and be arranged in the higher row of pixel that transmits error than using, the pixel that transmits the error of mixing is near using the pixel that transmits error.
Mixed type error transfer approach shown in Fig. 9 can be expressed as following formula 3 to formula 10.
[formula 3]
I even m ( x , y ) = I even ( x , y ) + E sum e ( x , y )
[formula 4]
I odd m ( x , y ) = I odd ( x , y ) + E sum o ( x , y )
[formula 5]
E sum e ( x , y ) = w - 1 , - 1 × E odd ( x - 1 , y - 1 ) + w 0 , - 1 × E even ( x , y - 1 ) + w 1 , - 1 × E odd ( x , y - 1 )
+ w - 1,0 × E even ( x - 1 , y )
[formula 6]
E sum o ( x , y ) = w - 1 , - 1 × E even ( x , y - 1 ) + w 0 , - 1 × E odd ( x , y - 1 ) + w 1 , - 1 × E even ( x + 1 , y - 1 )
+ w - 1,0 × E even ( x - 1 , y )
[formula 7]
O even ( x , y ) = F ( I even m ( x , y ) )
[formula 8]
O odd ( x , y ) = F ( I odd m ( x , y ) )
[formula 9]
E even ( x , y ) = I even m ( x , y ) - O even ( x , y )
[formula 10]
E odd ( x , y ) = I odd m ( x , y ) - O odd ( x , y )
Here, I Even(x y) is (x, y) input picture element signal, I in the even pixel frame Odd(x y) is (x, y) input picture element signal in the odd pixel frame; I Even m(x is that the (wherein error sends this input picture element signal to, I for x, y) input picture element signal in the even pixel frame y) Odd m(x is that the (wherein error sends this input picture element signal to for x, y) input picture element signal in the odd pixel frame y); E Sum e(x is to send (x, the y) error of picture element signal, E in the even pixel frame to y) Sum o(x is to send (x, y) error of picture element signal in the odd pixel frame to y); E Even(x y) is (x, the error that y) produces on the picture element signal, E in the even pixel frame Odd(x y) is (x, the error that y) produces on the picture element signal in the odd pixel frame; O Even(x y) is (x, the y) gradation data of picture element signal output, O in the even pixel frame Odd(x y) is (x, y) gradation data of picture element signal output in the odd pixel frame; F () is a function of determining the output gray level data, and the figure place of these output gray level data obtains reducing.
For example, in this case,, from 8 digital videos, calculate 2 output videos, obtain synthetic video as Figure 10 promptly according to the mixed type error transfer approach of formula 3 to formula 10.Compare with the video of the Fig. 8 that uses the independent error transfer approach, the synthetic video of Figure 10 provides level and smooth video to show and improved picture quality.
Figure 11 represents the error diffusion unit 400 ' according to embodiment, 500 ' block scheme, and they have been used the mixed type error and have transmitted and handle.
In error diffusion unit 400 ', 500 ', error diffusion unit 400 ' is handled error diffusion and is applied in the even pixel incoming frame, similar to the error diffusion unit 400 shown in Fig. 6 (a), comprise: totalizer 410,430, gradation data converter 420, delay cell D440, first line storage 455 and error diffusion coefficient elements 465, identical Reference numeral is carried out identical functions.Here, totalizer 410,430, gradation data converter 420 is identical with those parts in the error diffusion unit 400 shown in function and Fig. 6 (a) of delay cell 440.Therefore will those parts be described in detail.
In addition, error diffusion unit 500 ' is handled error diffusion and is applied to the odd pixel incoming frame, similar to the error diffusion unit 400 shown in Fig. 6 (b), comprise: totalizer 510,530, gradation data converter 520, delay cell (D540), second line storage 555 and error diffusion coefficient elements 565, identical Reference numeral is carried out identical functions.Here, totalizer 510,530, the function of gradation data converter 520 and delay cell 540 is identical with those parts in the error diffusion unit 500 shown in Fig. 6 (b).Therefore will those parts be described in detail.
According to embodiment use error diffusion unit that the mixed type error transmit to handle 400 ', 500 ' and Fig. 6 (a) and Fig. 6 (b) shown in the difference of error diffusion unit 400,500 be following points.
In diffusion unit according to embodiment, the line storage 455 of error diffusion unit 400 ' will postpone the error of delegation except the error diffusion coefficient elements 465 that outputs to error diffusion unit 400 ', also output to the error diffusion coefficient elements 565 of error diffusion unit 500 '.In the same way, in diffusion unit according to embodiment, the line storage 555 of error diffusion unit 500 ' will postpone the error of delegation except the error diffusion coefficient elements 565 that outputs to error diffusion unit 500 ', also output to the error diffusion coefficient elements 465 of error diffusion unit 400 '.Just, the error diffusion coefficient elements 465 of error diffusion unit 400 ' is mixed the error of exporting from the line storage 555 of error diffusion unit 500 ' from the sum of errors of line storage 455 outputs, and transmits resultant error.The error diffusion coefficient elements 565 of error diffusion unit 500 ' is mixed the error of exporting from the line storage 455 of error diffusion unit 400 ' from the sum of errors of line storage 555 outputs, and transmits resultant error.
Equally, replacing error diffusion in the dual numbers frame of pixels respectively and the error diffusion in the odd pixel frame carries out independently error diffusion and handles, the error diffusion of present embodiment is handled and own the fractional error DIFFUSION TREATMENT together in each line storage 455,555, and mixes the error that transmits.Therefore, the error diffusion of present embodiment is handled can show level and smooth video, and obtains improved picture quality.
Formula 3 shows that to formula 10 the mixed type error diffusion method of present embodiment is handled by the Floyd-Steinberg coefficient shown in Fig. 4.Yet, the invention is not restricted to this, the mixed type error diffusion method of present embodiment can be handled by other error diffusion coefficient.For example, in even pixel frame and odd pixel frame, carry out under the situation of independent error transfer approach, be relevant to the Fan coefficient shown in Figure 12, transmit error as Figure 13 (a) with (b).As shown in Figure 13 (c) in each independent frame under the situation of process errors, the error transmitting range increases.Therefore picture quality degenerates.For addressing this problem, can carry out mixed type error transfer approach with the Fan coefficient.As a result, can transmit error as shown in figure 14.Can replace formula 5 and formula 6 to represent that the mixed type error transmits processing with formula 11 and formula 12.
[formula 11]
E sum e ( x , y ) = w 0 , - 1 × E even ( x , y - 1 ) + w 1 , - 1 × E odd ( x , y - 1 ) + w 2 , - 1 × E even ( x + 1 , y - 1 )
+ w - 1,0 × E even ( x - 1 , y )
[formula 12]
E sum o ( x , y ) = w 0 , - 1 × E odd ( x , y - 1 ) + w 1 , - 1 × E even ( x + 1 , y - 1 ) + w 2 , - 1 × E odd ( x + 1 , y - 1 )
+ w - 1,0 × E odd ( x - 1 , y )
Though invention has been described in conjunction with the practical embodiments of thinking at present, but should be appreciated that, the present invention is not limited to disclosed embodiment, but opposite, is intended to cover the essence and various modifications in the scope and the equivalence arrangement that are included in appended claims.
For example, above-mentioned explanation is disclosed to be, a frame is divided into even pixel frame and odd pixel frame, uses mixed type error transfer approach to carry out error diffusion in the frame that each separates.The present invention is not limited to above-mentioned explanation, even this frame is divided at least three frames, also can use mixed type error transfer approach to carry out error diffusion in the frame that each separates.In this case, mixed type error transfer approach as shown in Figure 9 can mix the error of exporting from the frame that separates, so mixed type error transfer approach can be applied in 3 frames that separate at least.Those of ordinary skills can easily understand that this.
According to the present invention,, can carry out the high speed error diffusion for data from many pixels in the high-resolution display device.
In addition, by in error transmits, mixing the error of even pixel frame and odd pixel frame, improved the radio-frequency component of video, the video of the picture quality that therefore can be improved.

Claims (19)

1, a kind of in display device the method for propagated error, comprise:
A) each frame with incoming video signal is divided at least two independent subframes; With
B) error diffusion is handled be applied in each subframe of these at least two independent subframes, the wherein partially mixed error that transmits mutually from subframe, and error diffusion handled be applied on the combined error of each independent subframe.
2, the method for propagated error as claimed in claim 1, wherein at least two independent subframes are the odd number subframe pixel groups and the even number subframe pixel groups that is positioned at the even number line of a frame that are positioned at the odd-numbered line of a frame.
3, the method for propagated error as claimed in claim 2 is wherein handled for the error diffusion in the odd number subframe group, has added near the error that pixel transmitted in the even number subframe group of pixel, and error diffusion handled has been applied to combined error.
4, the method for propagated error as claimed in claim 3, the pixel that wherein is used for transmitting error in the even number subframe group is positioned at the higher row of pixel than odd number subframe group, and the transmission error that mix is increased in the pixel in this odd number subframe group.
5, the method for propagated error as claimed in claim 2 is wherein handled for the error diffusion in the even number subframe group, has added near the error that pixel transmitted in the odd number subframe of pixel, and error diffusion handled has been applied to combined error.
6, the method for propagated error as claimed in claim 5, the pixel that wherein is used for transmitting error in the odd number subframe group is positioned at the higher row of pixel than even number subframe group, and the transmission error that mix is increased in the pixel in this even number subframe group.
7, the method for propagated error as claimed in claim 4 wherein transmits the location of pixels of the error that is used to mix and determines according to the error diffusion coefficient type that is used for definite error.
8, a kind of driving apparatus for plasma display panel comprises:
Analog/digital converter is used for the analog video signal of input is converted to digital video signal and exports this digital signal, and wherein analog/digital converter is divided into each frame of vision signal at least two independent subframes and exports sub-frame data;
Contrary gamma corrector is used for the characteristic according to plasma display panel, and at least two independent subframes exporting from analog/digital converter are carried out contrary Gamma correction; With
Error diffuser is used for being applied to data by error diffusion is handled, will become from the data-switching of contrary gamma corrector output can be on plasma display panel the gray-scale displayed data, and export this gradation data,
Wherein each the subframe group that is applied at least two independent subframes is handled with error diffusion in the error diffusion unit, and part is mixed the error that transmits mutually from subframe therein.
9, driving apparatus for plasma display panel as claimed in claim 8, wherein the error diffusion unit comprises:
Odd number subframe error diffusion unit, be used for odd number subframe group execution error diffusion processing to the odd pixel of at least two independent subframes, wherein odd number subframe error diffusion unit mixes from the error that a plurality of pixel transmitted near pixel, the even pixel group that described a plurality of pixel is arranged at least two independent subframes is an even number subframe group, and the error diffusion processing is applied to combined error; And
Even number subframe error diffusion unit, being used for that the even number subframe group of at least two independent subframes is carried out error diffusion handles, wherein even number subframe error diffusion unit mix near pixel, be arranged in the error that a plurality of pixel transmitted of the odd number subframe group of at least two independent subframes, and error diffusion handled be applied to combined error.
10, driving apparatus for plasma display panel as claimed in claim 9, wherein odd number subframe error diffusion unit comprises:
First adder is used for and will be increased to from the gradation data of the odd number subframe group of contrary gamma corrector output from the error that a plurality of pixel transmitted near pixel, and the output gray level data;
The first gradation data converter is used for the gradation data from totalizer output is converted to and can go up the gray-scale displayed data at PDP (plasma display panel), and this gradation data is exported to PDP;
Second adder is used to calculate from the gradation data of first adder output and from the error between the gradation data of first gradation data converter output, and exports this error;
First delay cell is used for the pixel of error delay from second adder output, and exports this error;
First line storage is used for the error delay delegation from second adder output, and this error is exported to even number subframe error diffusion unit; And
The first error diffusion coefficient elements, be used for using predetermined error diffusion coefficient, and the sum of errors that obtains is exported to first adder from the error of even number subframe error diffusion unit output to the error that postpones by first delay cell and first line storage and export.
11, driving apparatus for plasma display panel as claimed in claim 9, wherein even number subframe error diffusion unit comprises:
The 3rd totalizer is used for and will be increased to from the gradation data of the even number subframe group of contrary gamma corrector output from the error that a plurality of pixel transmitted near pixel, and the output gray level data;
The second gradation data converter, be used for converting to from the gradation data of the 3rd totalizer output can be on PDP the gray-scale displayed data, and export to PDP;
The 4th totalizer is used to calculate from the gradation data of the 3rd totalizer output and from the error between the gradation data of second gradation data converter output, and exports this error;
Second delay cell is used for the pixel of error delay from the output of the 4th totalizer, and exports this error;
Second line storage is used for the error delay delegation from the output of the 4th totalizer, and this error is exported to odd number subframe error diffusion unit; And
The second error diffusion coefficient elements, be used for to the predetermined error diffusion coefficient of error application, and the sum of errors that obtains is exported to the 3rd totalizer from the error of odd number subframe error diffusion unit output by second delay cell and fourth line memory latency and output.
12, driving apparatus for plasma display panel as claimed in claim 10, wherein handle for the error diffusion in the odd number subframe group, mixed near the error that pixel transmitted in the even number subframe group of pixel, and error diffusion handled be applied to combined error.
13, driving apparatus for plasma display panel as claimed in claim 12, the pixel that wherein is used for transmitting error in the even number subframe group is positioned at the higher row of pixel than odd number subframe group, and the transmission error that mix is increased in the pixel in this odd number subframe group.
14, driving apparatus for plasma display panel as claimed in claim 11, wherein handle for the error diffusion in the even number subframe group, added near the error that pixel transmitted in the odd number subframe group of pixel, and error diffusion handled be applied to combined error.
15, driving apparatus for plasma display panel as claimed in claim 14, the pixel that wherein is used for transmitting error in the odd number subframe group is positioned at the higher row of pixel than even number subframe group, and the transmission error that mix is increased in the pixel in this even number subframe group.
16, a kind of in display device the method for propagated error, comprise:
A) receive simultaneously with the incoming frame demonstration in the corresponding data of at least two pixels that are adjacent to each other; With
B) error diffusion is handled these at least two pixels that are applied to import simultaneously, wherein each error that transmits from least two pixels is mixed, and error diffusion handled be applied to combined error, be applied to this at least two pixels so that error diffusion handled.
17, the method for propagated error as claimed in claim 16 wherein is adjacent to each other and at least two pixels of input simultaneously are the even pixel of odd pixel and close this odd pixel; With
In this case, be that the error diffusion processing is applied under the situation of two pixels simultaneously at least, for being handled, error diffusion is applied to odd pixel, to mix from the error that the last even pixel near this odd pixel transmits from the sum of errors that last odd pixel transmits, and the error diffusion processing is applied to combined error; Be applied to even pixel for error diffusion is handled, will mix from the error that the last odd pixel near this even pixel transmits from the sum of errors that last even pixel transmits, and the error diffusion processing is applied to combined error.
18, the method for propagated error as claimed in claim 17, the odd pixel that wherein transmits combined error is arranged in than combined error and is applied to the wherein higher row of even pixel.
19, the method for propagated error as claimed in claim 17, the even pixel that wherein transmits combined error are arranged in than combined error and are applied to wherein the higher row of odd pixel.
CNB2004100794924A 2003-08-12 2004-08-12 Method for executing high-speed error diffusion and driving device for plasma displaying panel Expired - Fee Related CN100395801C (en)

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